I have a course where students all move at their own pace. We are currently 3D printing things we design and kids move at all different paces. I have created a set of challenge lessons for the fast ones and have finally added them to my web site. I still have lots of work to do on it, but it is a quick way to get them to the fun stuff when it is not officially assigned. 
If you are interested in a quick peek at the work of the kids…
